People rarely ever see the Marten, due to its extreme shyness and hiding in dense forests. Marten are not well known, even though they are very active on the ground. The Marten is a carnivore and feeds on small prey, such as mice and squirrels. They have slender bodies and a bushy tail, almost like the squirrel, but with the body of a fox. They have small paws with retractable claws. The fur of these animals used to be very valuable in the Middle Ages.
The Marten has really dense fur, which is the main reason this animal is endangered. Hunters trap the mammal to take just the fur. With trees being constantly cut down or dying, it is causing the Marten to lose it's habitat. In 1980, this animal was reintroduced to the Black Hills and the breeding became successful. Certain areas are being blocked off and trees prohibited from being cut down for the survival of the Marten.